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RA: 14h 43m 24s
Dec: −57° 33′ 0″
Ch: MSA:985, U2:431, SA:25
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 32m
Mag: B=?, V=9.8
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 333 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a group of small stars with faint nebula. There is rather a gathering of the nebulous matter, about 10 arcseconds diameter, near the north side."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "cluster VII. Pretty rich, stars 11..13th mag, irregular, scattered,10' diameter, rather more comp M."
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Described in Union Obs. Circulars, 45-76, p 50. "Nebulae, clusters, etc. on Sydney Plates" as "Aggregation of faint stars."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 9' and the class as 2 2 m.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster.
15cm - mod f cl well sep from fld @ 80x. 140x: 8'-9' diam w/50 *s mostly m13+.
some brtr fld *s sup. mod well concen. BS, 26Feb1990, LCO.
1998-04-24/25, 11x80 tripod-mounted binoculars, Die Boord. Seeing average, transparency below average, dew. "Perhaps a nebulous presence between two 9.5 mag stars -- nothing certain."
12-inch f/10 SCT (76x)
This is a horse shoe cluster. The U form open up to the east consist of very faint stars somewhat stringy. The field around this U form is very busy with various magnitude stars.
The Messier objects
The Bennett objects
The Caldwell list
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